<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      color: red;
    }
  </style>
</head>
<body>
  <!-- 要求：把页面内所有的元素都设置为red -->
  <h1>我是h1</h1>
  <div>小姐姐</div>
  <p>小帅哥</p>
  <h2>我是h2</h2>
  <p>小可爱</p>
  <span>大可爱</span>
</body>
</html>